Locate the infinitive. Since it is used as a noun, determine its noun use. He likes to be chief. Infinitive: Use:

Your answer would be "to be chief".

Explanation:

"To be chief" is an infinitive clause which functions as the direct object of the transitive verb likes. An infinitive is a verbal consisting of the particle to plus a verb. In this case, the transitive verb to like selects two arguments: the NP he and the infinitive clause to be chief. In this way, it is possible to say that the inifinitive clause functions as an noun phrase. NPs usually occupy the direct object position.

what they said